MICROFACIES ANALYSIS OF THE EOCENE ÇAYRAZ FORMATION (HAYMANA BASIN, TURKEY): RESPONSE OF BENTHIC FORAMINIFERAL COMMUNITIES TO SEDIMENTARY CYCLICITY

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Microfacies analysis of the Eocene Çayraz formation (Haymana Basin Turkey) response of benthic foraminiferal communities to sedimentary cyclicitypdf.pdf

Date

2022-8-31

Author

Bengül, Nilya

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The Haymana Basin in central Anatolia (Turkey) formed during the closure of the Neo-Tethys in the Late Cretaceous to Middle Eocene as a forearc accretionary wedge. Middle Eocene aged units in this basin are exposed near Çayraz Village, Haymana. The Çayraz Formation is represented by the package of nummulitic banks and intercalation of calcareous mudstones. The aim of this study to investigate the sedimentary cyclicity and depositional sequences in the Eocene successions of the Haymana Basin. To be able to achieve this objective, the stratigraphic section has been measured. Detailed microfacies analyses of the carbonate succession have been carried out to determine the depositional model of the formation. The data indicate a ramp type depositional model. Fossil assemblages have been determined. These fossils are mainly larger benthic foraminifers; Nummulites sp., Assilina sp. and Alveolina sp., Orbitolites sp., Discocyclina sp.. Their relative abundances have been analyzed to determine their responses to cyclicity. The fossil associations in the depositional environment, have been used in vertical changes of the facies as in the lateral relationship of the facies. Thus, cyclic relationships in the stratigraphic sequence have been determined. A total of 21 cycles have been determined. A total of seven boundaries, two possible and five type-2, have been determined and six sequences have been recognized. The age of the stratigraphic sequence has been assigned as Early-early Middle Eocene. The age data has been used for the correlation of the sequence boundaries with the eustatic sea-level curve. The difference between sequence boundaries and the eustatic curve of might have resulted from tectonic activities.

Subject Keywords

Larger Benthic Foraminifera, Microfacies, Cyclicity, Sequence stratigraphy, Eocene Çayraz Formation, Haymana Basin

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https://hdl.handle.net/11511/99710

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

N. Bengül, “MICROFACIES ANALYSIS OF THE EOCENE ÇAYRAZ FORMATION (HAYMANA BASIN, TURKEY): RESPONSE OF BENTHIC FORAMINIFERAL COMMUNITIES TO SEDIMENTARY CYCLICITY,” M.S. - Master of Science, Middle East Technical University, 2022.